[Solved] C++ program does nothing when executed

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Vectors in c++ are dynamically sized.

You can create a vector without a size argument in the constructor then push size number of elements like so:

vector<int> makeGaps (int size){
    vector<int>  vectorOfGaps;
    for(int i = 0; i < size;i++){
        vectorOfGaps.push_back(i);
    }
    return vectorOfGaps;
}

Edit: Also, as someone already pointed out in your comments, it appears you had an off by one error in your for loop. If the for loop runs until x <= size, it will iterate size+1 number of times.

solved C++ program does nothing when executed